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Abstract

A solid-state camera and a motor-driven X-Y table are used with the distortion measurement system shown in Fig. 1. Test patterns displayed on the CRT are digitized with this equipment set-up. A bit-map of the image is created for data manipulation. Seven minutes is required to scan and digitize one test pattern image.

Country

United States

Language

English (United States)

This text was extracted from an ASCII text file.

This is the abbreviated version, containing approximately
100% of the total text.

Hand-Held CRT Scanner

A
solid-state camera and a motor-driven X-Y table are
used with the distortion measurement system shown in Fig. 1. Test
patterns displayed on the CRT are digitized with this equipment
set-up. A bit-map of the image is
created for data manipulation.
Seven minutes is required to scan and digitize one test pattern
image.

An
alternative manually-driven system is shown in Fig. 2.
Using one hand, an operator holds the scan fixture against the face
of the CRT. The operator's other hand
provides "scanning" motion
when he moves the electronics package from left to right. Eleven
seconds is required to scan and digitize a test pattern image when
using this system.

In the
alternative system, a linear array of charge-coupled
diodes (200/inch) provides image sensing over a wide range of CRT
intensities. Optics accommodate
faceplate curvature of approximately
0.250 inch. The electronics package is
supported by linear bearings
on precision shafts. The horizontal
position of the scanner is
determined with a linear digital transducer.